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This Page Updated
21st October 2016


Petzval Quadruplet Astrograph

OTA version includes MEF-3 and external Camera Angle Adjuster. Cradle, 7x50 finder and finder bracket not included.

The astrophotographers see in the FSQ-106ED one of the best astrographes available for the amateur astronomers. With its focal length of 530mm, an image circle of 88mm and a photographic field of 9,5, it acts as teleobjective for most powerful CCD and DSR/DSLR cameras of the market.

Based on a Petzval quadruplet optical design with apochromatic ED glasses, the FSQ-106ED is optimized for wide-field imaging of the deep sky. It offers a flat field, and comes equiped with a built-in camera angle adjuster and an oversized rack-and-pinion focuser. To minimize the size of the optical tube, it includes a retractable dewshield and an important backfocus.

The modified Petzval design of the FSQ-106ED, with the field flattener integrated inside the tube, makes it possible to cover all the photographic formats, from 35mm SLR/DSLR to 6x7 cameras. Its photographic image circle of 88mm of diameter (field of 9,5) does not have an equivalent on the market of the refractors of 100mm of aperture. CCD users will be able to dream with the use of large sensors without risk of vignetting or loss of definition in edge of field. As it is the tradition inside Takahashi company, the objective is entirely collimatable in order to compensate for the possible mechanical and thermal stresses. A perfect image is at this price.

Optics of exception goes of course with mechanics of exception. To replace the traditional camera angle adjuster, Takahashi integrated an oversized rotative rack-and-pinion focuser in the design of its optical tube. This device offers a perfect rigidity to all the types of photographic assembly, even the heaviest. Voluntarily limited, the rack-and-pinion course is controlled by a double system of focusing including a 1/7 microfocuser.
The optical tube assembly is equipped with a retractable dew shield, to gain in volume.

Resolutely directed towards astrophotography, the FSQ-106ED has very many accessory assemblies including visual ones. It has a 186 mm backfocus, which will charm the most demanding users. For examples of assembly, please see system-charts.
Even though this refractor is compact, it is quite heavy (125mm of diameter for a weight of 7 kg). Association with the EM-200 equatorial mount is ideal, including with a guidance system TGM in parallel. Many hardware configurations are available to optimize this astrograph and to turn the astrophotography of the deep sky into a moment of pleasure.

Takahashi FSQ-106EDX4 - Fully ExtendedTakahashi FSQ-106EDX4 - Retracted
FSQ-106EDX4 Technical Specifications
Optical System Modified Petzval quadruplet apochromat
Effective Aperture 106mm (4.2")
Focal Length 530mm (21")
Focal Ratio f/5
Image Circle 88mm (3.5")
Back Focus 153mm
Resolution 28mm (1.09 arc seconds)
Limiting Magnitude 11.9
Light Gathering Power 229X
OTA Length 675mm (Extended), 580mm (Contracted)
Weight 6.8kg
with Extender-Q 1.6X
Focal Length 850mm
Focal Ratio f/8
Image Circle 44mm (1.75")
Other Specifications are otherwise identical to TAKAHASHI FSQ-106ED / EDX / EDX3
TAKAHASHI FSQ-106EDX4 System Charts
Photo/Visual System System Chart (1st Page) - CLICK HERE
Extender-Q 1.6X System Chart (2nd Page) - CLICK HERE
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The above images and information and gathered from various online sources

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